pcompress/ppmd_compress.c
Moinak Ghosh 8f8af7ed6b Update adaptive mode heuristic based on algorithms.
Remove incorrect check in PPMd decompression code.
More refactoring of variable names.
2012-09-27 22:29:08 +05:30

149 lines
3.2 KiB
C

/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This program includes partly-modified public domain source
* code from the LZMA SDK: http://www.7-zip.org/sdk.html
*/
#include <stdio.h>
#include <sys/types.h>
#include <strings.h>
#include <utils.h>
#include <pcompress.h>
#include <allocator.h>
#include <Ppmd8.h>
/*
* PPMd model order to working set memory size mappings.
*/
unsigned int ppmd8_mem_sz[] = {
(16 << 20),
(16 << 20),
(32 << 20),
(32 << 20),
(64 << 20),
(64 << 20),
(100 << 20),
(100 << 20),
(400 << 20),
(400 << 20),
(700 << 20),
(700 << 20),
(700 << 20),
(1200 << 20),
(1200 << 20)
};
static ISzAlloc g_Alloc = {
slab_alloc,
slab_free,
NULL
};
void
ppmd_stats(int show)
{
}
int
ppmd_init(void **data, int *level, int nthreads, ssize_t chunksize)
{
CPpmd8 *_ppmd;
_ppmd = (CPpmd8 *)slab_alloc(NULL, sizeof (CPpmd8));
if (!_ppmd)
return (-1);
/* Levels 0 - 14 correspond to PPMd model orders 0 - 14. */
if (*level > 14) *level = 14;
_ppmd->Order = *level;
_ppmd->Base = 0;
_ppmd->Size = 0;
if (!Ppmd8_Alloc(_ppmd, ppmd8_mem_sz[*level], &g_Alloc)) {
fprintf(stderr, "Out of memory.\n");
return (-1);
}
Ppmd8_Construct(_ppmd);
*data = _ppmd;
if (*level > 9) *level = 9;
return (0);
}
int
ppmd_deinit(void **data)
{
CPpmd8 *_ppmd = (CPpmd8 *)(*data);
if (_ppmd) {
Ppmd8_Free(_ppmd, &g_Alloc);
slab_free(NULL, _ppmd);
}
*data = NULL;
return (0);
}
int
ppmd_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data)
{
CPpmd8 *_ppmd = (CPpmd8 *)data;
uchar_t *_src = (uchar_t *)src;
UInt32 i;
Ppmd8_RangeEnc_Init(_ppmd);
Ppmd8_Init(_ppmd, _ppmd->Order, PPMD8_RESTORE_METHOD_RESTART);
_ppmd->buf = (Byte *)dst;
_ppmd->bufLen = *dstlen;
_ppmd->bufUsed = 0;
Ppmd8_EncodeBuffer(_ppmd, _src, srclen);
Ppmd8_EncodeSymbol(_ppmd, -1);
Ppmd8_RangeEnc_FlushData(_ppmd);
*dstlen = _ppmd->bufUsed;
return (0);
}
int
ppmd_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data)
{
CPpmd8 *_ppmd = (CPpmd8 *)data;
Byte *_src = (Byte *)src;
Byte *_dst = (Byte *)dst;
size_t i;
int res;
_ppmd->buf = (Byte *)_src;
_ppmd->bufLen = srclen;
_ppmd->bufUsed = 0;
Ppmd8_RangeDec_Init(_ppmd);
Ppmd8_Init(_ppmd, _ppmd->Order, PPMD8_RESTORE_METHOD_RESTART);
res = Ppmd8_DecodeToBuffer(_ppmd, _dst, *dstlen, &i);
if (res < 0 && res != -1) {
if (Ppmd8_DecodeSymbol(_ppmd) != -1)
return (-1);
i++;
}
if (i < *dstlen)
return (-1);
return (0);
}